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Application mea Mai-ch 24., 1919.

To all 'whom t may concern.'

Be it known that 1, MANUEL N. ROBLES, a citizen of the United Mexican States, residing at Mexico, Federal District, Mexico, have invented certain new and useful Improvements in Stereoscopes, of which the following is a specification.

This invention relates to stereoscopes, and particularly to those called taxiphotos.

The object is to provide an apparatus for continuously sliding' stereoscopic pictures in 'front of eye-pieces from one rhomboidal follower box to another. rlhe positives or pictures on plate glass stand in the follower boxes on their edges, and means are provided for maintaining invariable tension on the total of pictures, whether they are piled up in one of the follower boxes or distributed in any other proportion in the two boxes, according to the number of pictures which, at any given moment, has been passed before the eye-glasses. Means have also been provided for reversing the course of said pictures as well as for piling them up in the follower box that is being charged.

In the drawing:

Figure 1 is a top view of the apparatus.

Fig. is a front view in elevation of same.

Fig. 3, is a perspective view of the picture pile holder.

N ow, referring to the drawings, (1) and (2) are rhomboidal follower boxes attached to or integral with the front sight box the fore part of which is open to let in the light, while the rear carries the common adjustable eye-pieces or lenses (6).

In the sight box are mounted spindles (7), having chain wheels (8) connected by the link chain (9). One of the spindles is geared to the handle (10) by the worm (11) and worm wheel (12), in order to be revolved and therewith the friction rubber wheels (13), which engage the pictures or plate glass (111), that is exposed in the middle part of the sight box (8), which part is one third of the sight box, or equal to the width of the follower boxes (1). and (2).

A simple presser bar (15) fulcrumed at (18) having ends (16) folded down and carrying presser casters (17), is thrown toward the follower box (1) in Fig. 1, so as to produce the escapement of the plates (14C) sliding from the follower box (2), when they Specification of Letters Patent.

Patented Nov. 25, 1919.

Serial No. 284,583.

have just passed the middle portion of the sight box This presser .bar (15) has a common spring attachment, not shown, to maintain it elastically against plates of the follower box momentaneously changed.

The bottoms (19) of the follower boxes (1) and (2) are grooved at (20), and a string (21), passing from a holder block down into the grooves around the idlers (23) in the sight box (3), is adjusted tight to the other holder block (2&1), in order to keep the plates upright in the boxes.

The operation of the apparatus is as follows: v

A number of pictures are placed in the follower box (2), tightening the string (21) between the holder blocks and (24), then, the first pictures will abut against the friction wheel (13) opposite the follower box (2), and by turning of the handle (10) the wheel engages the plate or picture, sliding it toward the follower box (1) into which it passes due to the pressure of the caster (17) swung to the position shown in Fig. 1. As soon as the first plate has passed the friction wheel (13) facing the follower box (2) then the friction wheel (13) facing the follower box 1), engages the first plate, leaving the second plate to be engaged and carried along. rlhis operation is repeated until all the pictures have been slid to the follower box In order to return the plates to the follower' box .(2), the end of the presser bar (15) opposite the follower box (2) is swung out, while the other end opposite the follower box (2) is turned to operative position, exerting pressure upon the plates or pictures when reaching the entrance to the follower box (2), and the handle (10) is revolved to the contrary.

Having thus described my invention what I claim is:

An apparatus for sliding stereoscopic picture plates, comprising two rhomboidal follower boxes adjoining a sight box spaced apart by a light opening in said sight box., equal in length to the width of one of said follower boxes, adjustable eye-pieces in said sight box between said follower boxes, a holder block for the plates in each follower box and a tension means extended between said holder blocks adapted to slide through Y lower said sight box, and i'iterchangeable means tor drawing a picture plate exposed to the VsightboX from the stoekpof plates in one follower box and passingrit in front of saiol light opening and toward the receiver folboX, an

cever follower looX when said plate has interchangeable presserV v means for pushing salcl plates into the reieaees MANUEL N. ROBLES.V 

